Abstract
The design of fiber-reinforced polymer–concrete hybrid beam is usually governed by deformation. Due to the rigidity degradation caused by fiber-reinforced polymer–concrete slip, the load–slip and load–deflection curves demonstrate a bilinear characteristic. The originality of this article is to propose a bilinear analytical model and to determine two dominant parameters in this model, namely, initial bond stress and slip modulus of the interconnection. This model consists of two distinct linear stages. In Stage I, full composite action between fiber-reinforced polymer and concrete is obtained, and no slip exists; Stage II commences once interfacial bond force diminishes, when slip increases linearly versus load, and the overall beam rigidity drops compared with that in Stage I, indicating only partial composite action is realized. Finally, three large-scale specimens were tested to validate the proposed bilinear model and to calculate the two parameters.
Highlights
Fiber-reinforced polymer (FRP) has been extensively applied in the aircraft, chemical, and automobile industries
To overcome the relatively low stiffness, local weakness, and initial high cost of all-FRP beams, FRP–concrete composite beams (Figure 1) have been researched recently.[1,2,3,4]. This system maximizes the advantages of both FRP and concrete: FRP behaves as the main girder in the tensile side while concrete deck in compression, enhancing the global stiffness and resistance to concentrated load.[5,6,7,8]
Deflection prediction considered the slip effect using the bilinear model In the bilinear model, the behavior of the FRP–concrete hybrid beams was divided into two stages: initial full composite action followed by partial composite action later
Summary
Fiber-reinforced polymer (FRP) has been extensively applied in the aircraft, chemical, and automobile industries. Deflection prediction considered the slip effect using the bilinear model In the bilinear model, the behavior of the FRP–concrete hybrid beams was divided into two stages: initial full composite action followed by partial composite action later. The former stage could be analyzed using familiar theories,[15,16,29,30] and the latter one is analyzed as follows. For deflection and stress calculation under vertical load, FRP–concrete composite structures are usually modeled elastically since the FRP is inherent linear elastic, and for simplicity, concrete experiences low stress levels until failure.
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